public class TestChar {
    public  static  void main(String[] args){
        char ch='a';
        char uniChar='\u0390';
        Character c = 'a';

        char [] charArray={'a','b','c'};
        System.out.println("HelloWorld！");
        System.out.println("\"菜鸟教程\"");
        System.out.println(Character.isLetter(2));
        System.out.println(Character.isDigit('x'));
    }
}
